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April 2008

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Subject:
From:
Bruce Tostevin <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 28 Apr 2008 16:41:12 -0400
Content-Type:
text/plain
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text/plain (76 lines)
Ken,

I was referring to the support pins used to support the panel from the
underside in the placement machine.  If one's misplaced or the wrong
length, you can get a repeatable, very localized component defect.

Bruce  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ken Bloomquist
Sent: Monday, April 28, 2008 4:32 PM
To: [log in to unmask]
Subject: Re: [TN] Cracking Ceramic Cap

Here are some answers to your questions:

Dave, [is there an end cap metallization such as nickel or copper
between
the solderable surface finish and the ceramic metalized layer?]
I'm not sure. I've asked Steve to post one more picture of the end of
the
fractured cap.

Mike, [Is your selective pallet hitting the cap in question when you
load/unload the board?]
Nope, I've checked the pallets and they are good with plenty of
clearance.

Werner, [The problem with Pb-free soldering is that all your caps... My
recommendation is to reduce all cap pads, and RRs as well, to half the
cap
widths to reduce the size of the solder fillet 'vise grips.' Those pad
widths were needed for wave soldering and the fillets for inspection.]
We are using SN63 not that other stuff ;-) We are a EMS so have very
little
control over our customer but will certainly share your comments with
them.
Any thoughts on an intermediate fix? What do you mean by "... RRs as
well"?

Bruce, [Possible support pin placement issue?]
I'm not sure what you mean by "possible support pin placement issue".
I'm
guessing you are saying the same thing as Werner though.

Thank you,

KennyB

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